Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/73d5b377f300
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25736 from KevinGrandon/bug_1092103_lockscreen_test_stale_reference

Bug 1092103 - [Lockscreen][IntegrationTest] Catch exceptions when comparing objects

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https://hg.mozilla.org/integration/gaia-central/rev/7f0cd09c122b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1092103 - [Lockscreen][IntegrationTest] Catch exceptions when comparing objects r=gweng
Bumping manifests a=b2g-bump